R.,
I am not a doctor, but I know what it's like to have some back pain...my son wieghed 8lbs 11 oz at birth and my daughter 10lbs 4 oz. The case may be that you are having problems with your sciatic nerve in your back. Does it hurt to get up if you lie down on your back even for a short time? Well mine did and does. Back pain s rough...but I have found good exercise really helps...and also warm baths help SO MUCH. Not to mention sleeping positions, when sleeping the best position is on the side with a pillow supporting the neck well and the knees slightly bent. Remember to try to keep your spine stright when sleeping. You could have a slipped disk though too. Kind of hard to say. my son is now 5 years old and i still have the same type of back pain from his birth! Oh by the way did you have an epidural, this can also be a side effect of it. REMEMBER EXERCISE EXERCISE EXERCISE!HTH